Changes in the timing of otolith zone formation in North Sea cod from otolith records: an early indicator of climate-induced temperature stress?

Millner, Richard S.; Pilling, Graham M.; McCully, Sophy R.; Høie, Hans

doi:10.1007/s00227-010-1539-9

Cited by 18 publications

(12 citation statements)

References 39 publications

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“…Translucent zone formation at temperatures higher than the optimal range for growth was found by Høie and Folkvord (2006), who used otolith stable oxygen isotopes to deduce the temperatures experienced by pen-reared Atlantic cod. Similar conclusions were reached by Millner et al (2011), who found that over a period of 20 years the annual timing of translucent zone formation was related to temperature, such that in warm years the formation started earlier than in cold years.…”

Section: Otolith Opacitysupporting

confidence: 83%

Otoliths as individual indicators: a reappraisal of the link between fish physiology and otolith characteristics

Grønkjær¹

2016

Mar. Freshwater Res.

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Abstract. Otoliths are remarkable recorders that store visual and chemical information that can be interpreted with regard to individual fish phenotype trajectory, life history events and environment. However, the information stored in the otoliths must be interpreted with the knowledge that the otolith is an integral part of fish sensory systems. This means that the environmental signals recorded in the otoliths will be regulated by the homeostatic apparatus of the individual fish -its physiology and ultimately its genetic make-up. Although this may complicate interpretation of environmental signals, it also opens up avenues for new research into the physiology and life history of individual fish. This review focuses on research areas where the coupling between otolith characteristics and fish physiology may yield new insights. Most of the research ideas are by no means new, but rather represent largely forgotten or less-explored research areas. Examples of questions that are fundamental, unanswered and with the potential to yield significant new insights are those related to the coupling of otolith and fish growth through metabolism, and the formation of opaque and translucent growth zones in relation to the physiology of the individual. An integration of visual and chemical data with bioenergetic modelling may yield some of the answers.

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Section: Otolith Opacitysupporting

confidence: 83%

Otoliths as individual indicators: a reappraisal of the link between fish physiology and otolith characteristics

Grønkjær¹

2016

Mar. Freshwater Res.

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“…This approach relies on the assumption that the environmental temperature threshold for G. selincuoensis growth and reproduction was relatively stable over time, which is supported by previous studies (Chen, 2000;Millner et al, 2011;Pilling et al, 2007). This approach relies on the assumption that the environmental temperature threshold for G. selincuoensis growth and reproduction was relatively stable over time, which is supported by previous studies (Chen, 2000;Millner et al, 2011;Pilling et al, 2007).…”

Section: Estimating Reproductive Phenology Changesmentioning

confidence: 52%

“…Changes in reproductive phenology were estimated by correlating mean daily temperature to LAFA differences among decades. This approach relies on the assumption that the environmental temperature threshold for G. selincuoensis growth and reproduction was relatively stable over time, which is supported by previous studies (Chen, 2000;Millner et al, 2011;Pilling et al, 2007). Based on the information of the daily mean air temperature of the decades, the LAFA differences among the decades, the mean MRFA/LAFA ratio (r) and the contribution of the number of daily increments (age) on the larval otolith radius (c), the growing season extension (GSE), and the reproduction advancement (RA) of G. selincuoensis were estimated.…”

Section: Estimating Reproductive Phenology Changesmentioning

confidence: 78%

“…By knowing the number of daily increments between the first annulus and the primordium (the initial complex structure of an otolith, reflecting the earliest stage of development), the relatively early or late birth among individuals of different year classes can be determined (Campana & Thorrold, 2001). This assumption requires that the periodicity of increments (daily and annually) is validated (Campana & Neilson, 1985), and assumes the environmental influence on annulus formation is relatively consistent among years (Millner, Pilling, McCully, & Høie, 2011;Pilling, Millner, Easey, Maxwell, & Tidd, 2007). Thus, by combining the environmental history and the otolith distance information, changes in fish reproductive phenology over time can be examined by a one-time sampling of juveniles and adults within different age classes based on the aforementioned assumptions.…”

Section: Introductionmentioning

confidence: 99%

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Strong evidence for changing fish reproductive phenology under climate warming on the Tibetan Plateau

Tao

Kennard

et al. 2018

Global Change Biology

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Phenological responses to climate change have been widely observed and have profound and lasting effects on ecosystems and biodiversity. However, compared to terrestrial ecosystems, the long-term effects of climate change on species' phenology are poorly understood in aquatic ecosystems. Understanding the long-term changes in fish reproductive phenology is essential for predicting population dynamics and for informing management strategies, but is currently hampered by the requirement for intensive field observations and larval identification. In this study, a very low-frequency sampling of juveniles and adults combined with otolith measurements (long axis length of the first annulus; LAFA) of an endemic Tibetan Plateau fish (Gymnocypris selincuoensis) was used to examine changes in reproductive phenology associated with climate changes from the 1970s to 2000s. Assigning individual fish to their appropriate calendar year class was assisted by dendrochronological methods (crossdating). The results demonstrated that LAFA was significantly and positively associated with temperature and growing season length. To separate the effects of temperature and the growing season length on LAFA growth, measurements of larval otoliths from different sites were conducted and revealed that daily increment additions were the main contributor (46.3%), while temperature contributed less (12.0%). Using constructed water-air temperature relationships and historical air temperature records, we found that the reproductive phenology of G. selincuoensis was strongly advanced in the spring during the 1970s and 1990s, while the increased growing season length in the 2000s was mainly due to a delayed onset of winter. The reproductive phenology of G. selincuoensis advanced 2.9 days per decade on average from the 1970s to 2000s, and may have effects on recruitment success and population dynamics of this species and other biota in the ecosystem via the food web. The methods used in this study are applicable for studying reproductive phenological changes across a wide range of species and ecosystems.

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“…Seasonal variations in otolith zone formation have been used to show how changes in temperature in the southern North Sea from 1985 to 2004 affected both phenology and growth of cod. Translucent otolith zones occur up to 22 days earlier in warm than in cold years and appear to be indicative of the onset of metabolic stress that results in slower growth (Millner et al 2011). Although changes in available food (possibly due to seasonal mismatch in production timing) have been suggested as a possible cause of the change in translucent zone formation, experimental evidence indicates that direct temperature effects are more likely (Neat et al 2008).…”

Section: Growth Phenology and Behaviourmentioning

confidence: 99%

Environmental Impacts—Marine Ecosystems

Brander

Ottersen

Bakker

et al. 2016

North Sea Region Climate Change Assessment

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This chapter presents a review of what is known about the impacts of climate change on the biota (plankton, benthos, fish, seabirds and marine mammals) of the North Sea. Examples show how the changing North Sea environment is affecting biological processes and organisation at all scales, including the physiology, reproduction, growth, survival, behaviour and transport of individuals; the distribution, dynamics and evolution of populations; and the trophic structure and coupling of ecosystems. These complex responses can be detected because there are detailed long-term biological and environmental records for the North Sea; written records go back 500 years and archaeological records many thousands of years. The information presented here shows that the composition and productivity of the North Sea marine ecosystem is clearly affected by climate change and that this will have consequences for sustainable levels of harvesting and other ecosystem services in the future. Multi-variate ocean climate indicators that can be used to monitor and warn of changes in composition and productivity are now being developed for the North Sea.

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Changes in the timing of otolith zone formation in North Sea cod from otolith records: an early indicator of climate-induced temperature stress?

Cited by 18 publications

References 39 publications

Otoliths as individual indicators: a reappraisal of the link between fish physiology and otolith characteristics

Otoliths as individual indicators: a reappraisal of the link between fish physiology and otolith characteristics

Strong evidence for changing fish reproductive phenology under climate warming on the Tibetan Plateau

Environmental Impacts—Marine Ecosystems

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